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Abstract

Developing a theory based on a spectral Green function for light emission from a point–dipole source embedded in a chiral sculptured thin film (CSTF), we found that the intensity and polarization of the emitted light are strongly influenced by the structural handedness of the CSTF as well as the placement and orientation of the source dipole. The emission patterns across both pupils of the dipole–containing CSTF can be explained in terms of the circular Bragg phenomenon exhibited by CSTFs when illuminated by normally as well as obliquely incident plane waves. The emission characteristics augur well for the future of CSTFs as optical biosensors as well as light emitters with controlled circular polarization and bandwidth.

Projections of PLCP onto the z = 0 plane for the reqions zobs > L (top row) and z < - L (bottom row), when S͇z(d,h)∙uJ ∈ {un,uτ,ub}, λ0 = 727nm and h = 1. The CSTF has been replaced by an isotropic material with relative permittivity that is the arithmetic mean of εa, εb, and εc of eqn. (40). The dipole source is located at d = 0.